/*
 * Copyright (c) 2010, Lauren Darcey and Shane Conder
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are 
 * permitted provided that the following conditions are met:
 * 
 * * Redistributions of source code must retain the above copyright notice, this list of 
 *   conditions and the following disclaimer.
 *   
 * * Redistributions in binary form must reproduce the above copyright notice, this list 
 *   of conditions and the following disclaimer in the documentation and/or other 
 *   materials provided with the distribution.
 *   
 * * Neither the name of the <ORGANIZATION> nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific prior 
 *   written permission.
 *   
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * <ORGANIZATION> = Mamlambo
 */
package com.mamlambo.articles.openglesprimer;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.app.Activity;
import android.content.Context;
import android.opengl.GLSurfaceView;
import android.opengl.GLU;
import android.os.Bundle;

// Note: NOT meant to be called. Left as an example.
public class QuickOpenGLShellActivity extends Activity {
    CustomSurfaceView mAndroidSurface = null;

    @Override
    protected void onPause() {
        super.onPause();
        if (mAndroidSurface != null) {
            mAndroidSurface.onPause();
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (mAndroidSurface != null) {
            mAndroidSurface.onResume();
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mAndroidSurface = new CustomSurfaceView(this);
        setContentView(mAndroidSurface);
    }

    private class CustomSurfaceView extends GLSurfaceView {
        final CustomRenderer mRenderer = new CustomRenderer();

        public CustomSurfaceView(Context context) {
            super(context);
            // request OpenGL ES 1.x (so we have a fixed shader pipeline)
            // NOTE: ES 1.x and ES 2.0 are not compatible.
            setEGLContextClientVersion(1);
            setRenderer(mRenderer);
        }
    }

    private class CustomRenderer implements GLSurfaceView.Renderer {
        public void onDrawFrame(GL10 gl) {
            // draw
        }

        public void onSurfaceChanged(GL10 gl, int width, int height) {
            gl.glViewport(0, 0, width, height);

            float ratio = (float) width / height;
            gl.glMatrixMode(GL10.GL_PROJECTION);
            gl.glLoadIdentity();
            // a common way to set the aspect ratio properly
            gl.glFrustumf(-ratio, ratio, -1, 1, 1, 50);
            GLU.gluLookAt(gl, 0, 0, 12f, 0, 0, 0, 0, 1, 0f);
        }

        public void onSurfaceCreated(GL10 gl, EGLConfig config) {
            // one-time initialization; items that don't change when the surface
            // metrics change
            gl.glDisable(GL10.GL_DITHER);
            gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
            gl.glClearColor(0.7f, 0.7f, 0.7f, 1);
            gl.glEnable(GL10.GL_DEPTH_TEST);
            gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);

        }
    }
}
